Although Carnot Cycle is used in thermodynamic analysis,it is not possible to run a steam engine in Carnot Cycle in real life. a)Why Carnot Cycle is usefel in design? b)Why we cannot run a real steam engine in carnot cylce? c)Although steam engine is rarely today,we still learn about it ? Why? Solution 1. The Carnot Heat Engine Cycle gives the maximum possible thermal efficiency and net work , W NET , for any Heat Engine operating between given heat source temperature , TH , and any heat sink temperature , TL . 2. The Carnot Heat Engine Cycle is a reversible Heat Engine Cycle. There are no reversible Heat Engine cycles for steam or any other substance. 3. Data, like Steam Tables, is widely available for analyzing Steam Engines. The Steam Power Plant Cycle to generate electricity is very common. .